William H. Acker

I saw with interest an entry for William H. Acker, Jr. on Descendants of Elizabeth M. Brocksmier at http://familytreemaker.genealogy.com. http://familytreemaker.genealogy.com. I am looking for a lost uncle who was born as Albert W. Hirner on Nov. 19, 1895, the same date as William Acker, Jr. My uncle was adopted after his mother died in 1896. His brothers tried to find out who adopted him and were told that the family's name was Ackerman. I thought that I would check the WWI draft registration data for Ackerman, but the closest match was for William Acker, Jr. Does anyone know if he survived the war, and if so if he had any offspring? I would be most appreciative of any information someone might be able to supply.